Does magnetic field impact tidal dynamics inside the convective zone of low-mass stars along their evolution?
Does magnetic field impact tidal dynamics inside the convective zone of low-mass stars along their evolution?
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磁场是否会影响低质量恒星演化过程中对流区内的潮汐动力学？
DOI：
10.1051/0004-6361/201936477
复制
发表时间：
2019
影响因子：
6.5
通讯作者：
É. Bolmont
中科院分区：
文献类型：
--
作者：
A. Astoul;S. Mathis;C. Baruteau;François Gallet;A. Strugarek;K. Augustson;A. Brun;É. Bolmont
语境。低质量恒星对流包层内波状潮汐流动能的耗散是塑造短周期系外行星系统轨道和旋转动力学的关键物理机制之一。尽管低质量恒星是磁活跃天体，但恒星磁场如何影响大规模潮汐流以及潮汐波的激发、传播和消散的问题仍然悬而未决。
目标。我们的目标是研究恒星磁性对潮汐波的影响，以及潮汐波在低质量恒星演化过程中在对流包层中的传播和消散。
方法。我们估计了低质量恒星（从 M 型到 F 型）整个结构和旋转演化过程中，磁对潮汐感应磁惯性波的强迫和耗散的贡献幅度。为此，我们使用了通过恒星演化代码 STAREVOL 计算的旋转恒星模型的详细网格。发电机产生的磁场的幅度是通过对流包络线底部和顶部的物理缩放定律来估计的。
结果。我们发现，在近圆形轨道和共面热木星行星系统的情况下，恒星的大尺度磁场对潮汐波的激发影响不大，但对波的消散方式有很大影响。因此，我们的结果表明，需要对潮汐波的传播和消散进行全面的磁流体动力学处理，以正确评估恒星与行星潮汐相互作用在承载短周期大质量行星的低质量恒星的整个演化历史中的影响。
Context. The dissipation of the kinetic energy of wave-like tidal flows within the convective envelope of low-mass stars is one of the key physical mechanisms that shapes the orbital and rotational dynamics of short-period exoplanetary systems. Although low-mass stars are magnetically active objects, the question of how the star’s magnetic field impacts large-scale tidal flows and the excitation, propagation and dissipation of tidal waves still remains open.
Aims. Our goal is to investigate the impact of stellar magnetism on the forcing of tidal waves, and their propagation and dissipation in the convective envelope of low-mass stars as they evolve.
Methods. We have estimated the amplitude of the magnetic contribution to the forcing and dissipation of tidally induced magneto-inertial waves throughout the structural and rotational evolution of low-mass stars (from M to F-type). For this purpose, we have used detailed grids of rotating stellar models computed with the stellar evolution code STAREVOL. The amplitude of dynamo-generated magnetic fields is estimated via physical scaling laws at the base and the top of the convective envelope.
Results. We find that the large-scale magnetic field of the star has little influence on the excitation of tidal waves in the case of nearly-circular orbits and coplanar hot-Jupiter planetary systems, but that it has a major impact on the way waves are dissipated. Our results therefore indicate that a full magneto-hydrodynamical treatment of the propagation and dissipation of tidal waves is needed to properly assess the impact of star-planet tidal interactions throughout the evolutionary history of low-mass stars hosting short-period massive planets.
太阳型恒星中心附近的内波破碎和潮汐耗散
DOI：
10.1111/j.1365-2966.2010.16400.x
发表时间：
2010
影响因子：
4.8
作者：
Barker A
通讯作者：
Barker A
影响因子：
4.8
作者：
Bell, Cameron P. M.;Naylor, Tim;Littlefair, S. P.
通讯作者：
Littlefair, S. P.